package com.bj.jiufu.util.crypto;

import java.util.HashMap;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.apache.log4j.Logger;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.bj.jiufu.bsns.user.controller.UserController;

/**
 * 
 * @author shen_feng 加密解密
 */
public class AesUtil
{
	/** 日志实例 */
	private static final Logger logger = Logger.getLogger(AesUtil.class);
    
    /**
     * 密钥如超过16位，截至16位，不足16位，补/000至16位
     * 
     * @param key原密钥
     * @return 新密钥
     */
    public static String secureBytes(String key)
    {
        if (key.length() > 16)
        {
            key = key.substring(0, 16);
        }
        else if (key.length() < 16)
        {
            for (int i = (key.length() - 1); i < 15; i++)
            {
                key += "\000";
            }
        }
        return key;
    }
    
    /**
     * AES解密
     * 
     * @param sSrc
     * @param sKey
     * @return
     * @throws Exception
     */
    public static String decrypt(String sSrc, String key)
    {
        
        String sKey = secureBytes(key);
        
        try
        {
            // 判断Key是否正确
            if (sKey == null)
            {
                return null;
            }
            // 判断Key是否为16位
            if (sKey.length() != 16)
            {
                sKey = secureBytes(sKey);
            }
            byte[] raw = sKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            byte[] encrypted1 = hex2byte(sSrc);
            try
            {
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original, "utf-8");
                return originalString;
            }
            catch (Exception e)
            {
            	logger.error(e);
                return null;
            }
        }
        catch (Exception ex)
        {
        	logger.error(ex);
            return null;
        }
        
    }
    
    public static String encrypt4Contacts(String sSrc)
    {
        return sSrc;
    }
    
    /**
     * AES加密
     * 
     * @param sSrc
     * @param sKey
     * @return
     * @throws Exception
     */
    public static String encrypt(String sSrc, String key)
    {
        
        String sKey = secureBytes(key);
        try
        {
            if (sSrc == null || sKey == null)
            {
                return null;
            }
            // 判断Key是否为16位
            if (sKey.length() != 16)
            {
                sKey = secureBytes(sKey);
            }
            byte[] raw = sKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
            byte[] encrypted = cipher.doFinal(sSrc.getBytes());
            // byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
            return byte2hex(encrypted).toLowerCase();
        }
        catch (Exception e)
        {
        	logger.error(e);
            return null;
        }
    }
    
    /**
     * @param strhex
     * @return
     */
    public static byte[] hex2byte(String strhex)
    {
        if (strhex == null)
        {
            return null;
        }
        int l = strhex.length();
        if (l % 2 == 1)
        {
            return null;
        }
        byte[] b = new byte[l / 2];
        for (int i = 0; i != l / 2; i++)
        {
            b[i] = (byte)Integer.parseInt(strhex.substring(i * 2, i * 2 + 2), 16);
        }
        return b;
    }
    
    /**
     * @param b
     * @return
     */
    public static String byte2hex(byte[] b)
    {
        String hs = "";
        String stmp = "";
        for (int n = 0; n < b.length; n++)
        {
            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1)
            {
                hs = hs + "0" + stmp;
            }
            else
            {
                hs = hs + stmp;
            }
        }
        return hs.toUpperCase();
    }
}
